package com.rljk.utils;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Map;
/**
 @Function 调用HTTP协议接口所用工具类
 @Author 于泓磊
 @Date   2017年12月7日
*/
public class HttpClientUtil {
	
	    private static PoolingHttpClientConnectionManager cm;  
	    private static String EMPTY_STR = "";  
	    private static String UTF_8 = "UTF-8";  
	  
	    private static void init() {  
	        if (cm == null) {  
	            cm = new PoolingHttpClientConnectionManager();  
	            cm.setMaxTotal(50);// 整个连接池最大连接数  
	            cm.setDefaultMaxPerRoute(5);// 每路由最大连接数，默认值是2  
	        }  
	    }  
	  
	    /** 
	     * 通过连接池获取HttpClient 
	     *  
	     * @return 
	     */  
	    private static CloseableHttpClient getHttpClient() {  
	        init();  
	        return HttpClients.custom().setConnectionManager(cm).build();  
	    }  
	  
	    /** 
	     *  
	     * @param url 
	     * @return 
	     */  
	    public static String httpGetRequest(String url) {  
	        HttpGet httpGet = new HttpGet(url);  
	        return getResult(httpGet);  
	    }  
	  
	    public static String httpGetRequest(String url, Map<String, Object> params) throws URISyntaxException {  
	        URIBuilder ub = new URIBuilder();  
	        ub.setPath(url);  
	  
	        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  
	        ub.setParameters(pairs);  
	  
	        HttpGet httpGet = new HttpGet(ub.build());
			System.out.println("httpGet:"+httpGet);
			return getResult(httpGet);
	    }  
	  
	    public static String httpGetRequest(String url, Map<String, Object> headers, Map<String, Object> params)  
	            throws URISyntaxException {  
	        URIBuilder ub = new URIBuilder();  
	        ub.setPath(url);  
	  
	        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  
	        ub.setParameters(pairs);  
	  
	        HttpGet httpGet = new HttpGet(ub.build());  
	        for (Map.Entry<String, Object> param : headers.entrySet()) {  
	            httpGet.addHeader(param.getKey(), String.valueOf(param.getValue()));  
	        }  
	        return getResult(httpGet);  
	    }  
	  
	    public static String httpPostRequest(String url) {  
	        HttpPost httpPost = new HttpPost(url);  
	        return getResult(httpPost);  
	    }  
	  
	    public static String httpPostRequest(String url, Map<String, Object> params) throws UnsupportedEncodingException {  
	        HttpPost httpPost = new HttpPost(url);  
	        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  
	        httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));  
	        return getResult(httpPost);  
	    }  
	  
	    public static String httpPostRequest(String url, Map<String, Object> headers, Map<String, Object> params)  
	            throws UnsupportedEncodingException {  
	        HttpPost httpPost = new HttpPost(url);  
	  
	        for (Map.Entry<String, Object> param : headers.entrySet()) {  
	            httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));  
	        }  
	  
	        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  
	        httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));  
	  
	        return getResult(httpPost);  
	    }  
	  
	    private static ArrayList<NameValuePair> covertParams2NVPS(Map<String, Object> params) {
	        ArrayList<NameValuePair> pairs = new ArrayList<NameValuePair>();  
	        for (Map.Entry<String, Object> param : params.entrySet()) {  
	            pairs.add(new BasicNameValuePair(param.getKey(), String.valueOf(param.getValue())));  
	        }  
	  
	        return pairs;  
	    }  
	  
	    /** 
	     * 处理Http请求 
	     *  
	     * @param request 
	     * @return 
	     */  
	    private static String getResult(HttpRequestBase request) {  
	        // CloseableHttpClient httpClient = HttpClients.createDefault();  
	        CloseableHttpClient httpClient = getHttpClient();  
	        try {  
	            CloseableHttpResponse response = httpClient.execute(request);  
	            // response.getStatusLine().getStatusCode();  
	            HttpEntity entity = response.getEntity();  
	            if (entity != null) {  
	                // long len = entity.getContentLength();// -1 表示长度未知  
	                String result = EntityUtils.toString(entity);  
	                response.close();  
	                // httpClient.close();  
	                return result;  
	            }  
	        } catch (ClientProtocolException e) {  
	            e.printStackTrace();  
	        } catch (IOException e) {  
	            e.printStackTrace();  
	        } finally {  
	  
	        }  
	  
	        return EMPTY_STR;  
	    }  
	    
	  
	}  
